Store your spare batteries in with your spare wheel ... My spare wheel is under the floor in the car boot (trunk) and is by far the coolest (least warm) place in the car ... Under the front seat is also fairly good.
With an air temperature of about 71 degrees F , the dashboard temperature in the sun can be nearly 150F after a few hours ... The glove box will be nearly 130F under these conditions.
I did a test on this somewhere amongst the threads and was amazed that here in the UK the car interior could get that hot ... I don't know how hot the car interior would be in California as I guess it would be warmer than the UK.
The upper temperature limit for a Lithium primary cell is 140F apparently.
If you were quoting an air temperature of 130F , then the temperature of a black plastic dashboard in full sun is going to be way over that ... I used an infra-red thermometer that had a range of -4F to 428F (-20C to 220C).
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